Food & nutrition
Why a Cut Apple Changes Color: Enzymatic Browning
Enzymatic browning is the reaction in which enzymes in fruits and vegetables use oxygen to oxidize phenolic compounds into brown pigments. This piece covers how polyphenol oxidase
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Chemistry
A Different Color for Every Element: The Flame Test
A flame test identifies metal elements by the unique color of light they emit in a flame. This piece covers how the colors arise, Bunsen and Kirchhoff’s spectroscopy, fireworks, an
Food & nutrition
Water and Oil as One: Emulsion
An emulsion keeps immiscible liquids together as tiny droplets with the help of emulsifiers. From mayonnaise and milk to butter, this piece walks through O/W and W/O types, Bancrof
Chemistry
The Hill Every Reaction Must Climb: Activation Energy
Why don’t books on a shelf catch fire by themselves? Reactions must first climb an energy hill called activation energy. This piece covers the Arrhenius equation, why heat speeds r
Chemistry
Water Moving Across a Single Membrane: Osmosis
Why does salted cabbage release its water overnight? This article covers what osmosis is, the three factors that drive it, everyday examples, and reverse osmosis, the technology th
Chemistry
Water That Doesn't Freeze When It Should: Supercooling
Why does water sometimes stay liquid below freezing? This article explains what supercooling is and how it works, everyday examples such as clouds, freezing rain, and hand warmers,
Physics
The Endless Jiggle: Brownian Motion
Why do tiny particles in water never stop jiggling? This article explains Brownian motion, first observed by Robert Brown, the principle Einstein uncovered behind it, Perrin's expe
Chemistry
Same Element, Different Faces: Allotropes
How can pencil lead and a diamond ring be made of exactly the same carbon? This article explains allotropes: what they are and how they arise, the many faces of carbon, examples fr
Chemistry
Mirror-Image Twin Molecules: Chirality
Chirality is the property of an object or molecule that cannot be superimposed on its own mirror image. This article covers the basic definition of chirality, how mirror-image mole
Chemistry
The Force That Restores Balance: Le Chatelier's Principle
Le Chatelier's principle states that when a system at chemical equilibrium is disturbed by a change in concentration, pressure, or temperature, the equilibrium shifts in the direct
Chemistry
Batteries: Chemical Structures That Store Energy
From the smartphone we check as soon as we open our eyes each morning to electric cars quietly passing along the street, laptops, and power banks, the daily lives of people today w
Physics
The Uncertainty Principle: New Possibilities for Innovation
Quantum mechanics is a theoretical framework that plays an important role in understanding the fundamental properties of matter and energy. Among its principles, the uncertainty pr